// 题9
function Test9() {
    function SuperType() {
        this.property = true
    }
    SuperType.prototype.getSuperValue = function () {
        return this.property
    }
    function SubType() {
        this.subproperty = false
        // this.property = 'aaa'
    }
    SubType.prototype = new SuperType
    SubType.prototype.getSubValue = function () {
        return this.subproperty
    }
    var instance = new SubType
    console.log(instance.getSuperValue());
}
Test9()
// 结果：
// 
/**
 * 解析：
 * 
 */